Dear André,
As a Google Cloud Professional Cloud Architect, Certified Kubernetes Administrator, and experienced freelancer with expertise in AWS infrastructure, I am confident that I can help you troubleshoot and resolve the issue you are facing with metal-lb while trying to expose your nginx server locally on your network. I have experience in working with Rancher with Vmware, lets meet and i can take a look at your setup and we can create a "helloworld" nginx deployment with an external IP.
Please let me know your availability, and we can schedule our session promptly.
Best regards,
Rehman Syed